1909.] NATURAL SCIENCES OF PHILADELPHIA. 251 



Jaws of somewhat soft and flexible brown chitinoid material, the 

 teeth somewhat whitened and hardened by a calcareous deposit. 

 Mandibles (PI. VII, fig. 11) consisting of long, slender, strongly diver- 

 gent carriers, firmly united anteriorly and bearing white, hard, cal- 

 careous, subovate distal plates with smooth and entire margins. For- 

 ceps jaws (PI. VII, fig. 12) massive, with an undivided, shield-shaped 

 base about three-fifths as wide as long, truncate distally, pointed 

 behind ; the forceps stout with strongly ridged but toothless bases and 

 hooked tips flattened and angulated along the concavity. Second 

 pair of maxillae (II) also massive, the left one with three, the right 

 with four stout teeth. Maxillae (III) consist of a pair of crescentic 

 plates bearing ridges with five teeth on the left, six on the right side; 

 IV bears three or four stout teeth on the left side and a low edentulous 

 ridge on the right side; V is represented on the left side only and is 

 similar to the right IV. 



Color in life unknown, but probably pale reddish like other species 

 of the gems. 



Known only from the vicinity of Monterey Bay; "big tide pool. 

 June 20, 1905," E. C. Starks. 



Marphysa californica sp. nov. (Plates VII and VIII, figs. 13-20). 



This species is based upon the anterior ends of two specimens, one 

 (type) very large, measuring 11 mm. wide and 80 mm. long for 92 

 segments, the other, consisting of 140 segments, 45 mm. long and 3 

 mm. wide. Both are much contracted. 



Prostomium retracted beneath nuchal collar as far as base of ten- 

 tacles, the exposed portion nearly as wide as long and consisting 

 chiefly of the pair of broadly ovate frontal lobes divided by a median 

 furrow that reaches nearly to the median tentacle, but with no trace 

 of a ventral transverse furrow. Tentacles five, arising along a trans- 

 verse curved line, median and outer pair subequal, the inner pair 

 slightly longer and about equal to one and one-half times the width 

 of the prostomium. They are longer and more slender than those 

 of M . stylobranchiata and taper regularly to the end, being marked by 

 irregular, more or less conspicuous transverse wrinkles for the entire 

 length. Eyes one pair, inconspicuous and small, behind and external 

 to the base of the inner paired tentacles. 



Peristomium large, terete, swollen and furrowed laterally where 

 it is more than three times as long as somite II, which is simple and 

 apodous and about as long as the succeeding podous segments. No 

 nuchal cirri. Remaining segments foot-bearing, the first five or six 

 terete and narrow, after which they become wider and more depressed 



